2649891 has 8 divisors (see below), whose sum is σ = 3555520. Its totient is φ = 1755432.

The previous prime is 2649887. The next prime is 2649893. The reversal of 2649891 is 1989462.

2649891 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 2649891 - 2² = 2649887 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2649893) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2221 + ... + 3198.

It is an arithmetic number, because the mean of its divisors is an integer number (444440).

2^2649891 is an apocalyptic number.

2649891 is a deficient number, since it is larger than the sum of its proper divisors (905629).

2649891 is a wasteful number, since it uses less digits than its factorization.

2649891 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5585.

The product of its digits is 31104, while the sum is 39.

The square root of 2649891 is about 1627.8485801818. The cubic root of 2649891 is about 138.3808530152.

The spelling of 2649891 in words is "two million, six hundred forty-nine thousand, eight hundred ninety-one".